Refills would only encourage camping at mid so NO. We don't need more annoying campers that rely on other players to do the work and then for them just to die. Food healing is a core part of BRLNS pvp and adds a whole new dynamic. Hunger bar PVP is A LOT worse. Food should take more time to consume instead of an instantaneous eating but not as much time as eating food in vanilla. Maybe like 2 sec for most food. Food that heals less should be instantaneous eating like melons, beetroot, carrots and other stuff like that so they have a bigger use in the meta game. Food needs balancing changes, but should still heal.
You have good ideas and a good mind, making sure people have fun but you also need to remember the skill and meta game aspects of minigames.